Authorities are investigating the death of an apparent motorcycle rider who was found floating face down Monday in an inlet near Tomales.

The incident was reported at about 4:30 p.m. on Shoreline Highway about a mile south of Tomales, where a creek flows into Tomales Bay. The victim was found floating a few feet offshore, according to the Marin County Fire Department.

The victim was wearing a motorcycle helmet, but there was no motorcycle on the ground in the area. A sheriff’s dive team was called to search the water for a motorcycle.

The California Highway Patrol and the Marin County Sheriff’s Office were investigating the incident. The CHP reported that it appears there was no traffic collision involving another vehicle.

The county coroner’s division was confirming the victim’s name and investigating the cause of death.